the fbi now thinks he may have died by friendly fire. 30-year-old nicholas ivy was shot and killed this week in arizona. shell casings found at the scene was fired by ivy and another agent who was wounded. >> as you know, investigators have made progress into the investigation into agent ivy's death and are looking into the possibility that it was a tragic accident. the result of friendly fire. >> ivy is the third border patrol agent killed in the line of duty this year. >>> and in colorado, an amber alert has been issued after a 10-year-old girl disappeared on her way to school. this is a picture of her. take a look. the search was delayed because the girl's mother didn't know she was immediately missing. the mother slept through calls from school officials saying she had not arrived. police searched the surrounding area, but so far nothing. >>> the number of cases of fungal meningitis is growing. 47 people have been infected. it was distributed in 23 states, but now has been recalled. five people have died. our chief medical correspondent dr. sanjay gupta has much more. >> randi, it's